Cabeza de Vaca, Alvar Núñez. The journey of Alvar Nuñez Cabeza de Vaca and his companions from Florida to the Pacific, 1528-1536, book, 1922; (https://texashistory.unt.edu/ark:/67531/metapth3001/m1/1/: accessed April 26, 2018), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .